The usual starting book is 'Practical Common Lisp' by Peter Seibel. Some advanced stuff then in 'Common Lisp Recipes' by Edi Weitz. Some older advanced stuff with examples: Paradigms of Artificial Intelligence Programming, Cases Studies in Common Lisp (PAIP) by Peter Norvig.
I think this "A Road to Common Lisp" is a very good introductory guide
I'd be interested to see what others consider a suitable general learning path for Lisp.
[0] http://www.paulgraham.com/acl.html
[1] http://shop.oreilly.com/product/9781593272814.do